Maxim MAX14611 Quad Bidirectional Logic-Level Translator provides the level shifting necessary to allow data transfer in a multi-voltage system. Externally applied voltages, VCC and VL, set the logic levels on either side of the device. A low-voltage logic signal present on the VL side of the device appears as a high-voltage logic signal on the VCC side of the device, and vice-versa. The device is ideal for I2C bus as well as MDIO bus applications where an open-drain operation is often required. The device features a three-state output mode (active-low TS). Drive active-low TS high to connect the pull-up to the powered I/O port. This allows for continuous, undisrupted I2C operation on the powered side of the device while the level translation function is off.